The answer is to set the log generation to 'All sessions' in the firewall policy. This is correct because FortiGate’s default logging behavior on a policy typically records only session start events, which capture when a session is initiated but omit the detailed traffic logs needed for per-session analysis. By changing the log generation setting to 'All sessions', the FortiGate will record the complete session lifecycle, including traffic volume, duration, and packet counts, enabling the granular traffic analysis required for troubleshooting or auditing. On the Fortinet NSE 4 exam, this concept tests your understanding of how firewall policy logging differs from security profile logging—a common trap is assuming that enabling security profiles like IPS or antivirus automatically generates detailed logs, but they only inspect traffic without changing log verbosity. A useful memory tip: think of “All sessions” as the switch that moves logging from a simple “hello” to a full “conversation transcript,” ensuring no traffic detail is missed.
NSE4 Firewall Policies and NAT Practice Question
This NSE4 practice question tests your understanding of firewall policies and nat. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network admin needs to log all traffic from the sales VLAN to the internet. The firewall policy is configured with logging enabled. However, the admin notices that only session start logs are generated, not detailed traffic logs. What setting must be enabled to capture per-packet or per-session details?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the log generation to 'All sessions' in the policy
Option C is correct because in FortiGate, the 'Log Generation' setting on a firewall policy controls whether logs are generated for session start only or for all sessions. By default, a policy may log only session start events; setting it to 'All sessions' ensures that per-session details (including traffic volume, duration, and packet counts) are recorded. This is distinct from enabling security profiles, which inspect traffic but do not change the logging verbosity.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable 'Log Memory' on the policy
Why it's wrong here
Memory logging is a storage location, not a detail level.
✗
Enable security profiles
Why it's wrong here
Security profiles can generate logs, but they are separate from basic traffic logging.
✓
Set the log generation to 'All sessions' in the policy
Why this is correct
This ensures that every session generates log entries, including per-session details.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a traffic shaper
Why it's wrong here
Traffic shapers do not affect logging.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse enabling security profiles (like UTM features) with increasing log verbosity, but security profiles only inspect content and do not change the policy's log generation setting from 'Session start' to 'All sessions'.
Detailed technical explanation
How to think about this question
Under the hood, FortiGate's firewall policy log generation has three modes: 'Session start', 'Session end', and 'All sessions'. 'All sessions' logs both the start and end of each session along with detailed statistics like bytes sent/received and duration, which is essential for auditing or forensic analysis. In a real-world scenario, if you need to track data usage per user in the sales VLAN, setting 'All sessions' on the policy ensures the logs contain the total traffic volume per session, whereas 'Session start' only records that a session was initiated.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Firewall Policies and NAT — This question tests Firewall Policies and NAT — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the log generation to 'All sessions' in the policy — Option C is correct because in FortiGate, the 'Log Generation' setting on a firewall policy controls whether logs are generated for session start only or for all sessions. By default, a policy may log only session start events; setting it to 'All sessions' ensures that per-session details (including traffic volume, duration, and packet counts) are recorded. This is distinct from enabling security profiles, which inspect traffic but do not change the logging verbosity.
What should I do if I get this NSE4 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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